# Epicycles vs 100 Things You Should Know

The clearest difference is in-app purchases: Epicycles at none against 100 Things You Should Know's 6. Epicycles also leads on iOS requirement (15.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. 100 Things You Should Know sells 6 one-off in-app purchases. Epicycles asks for nothing beyond the download.

## The numbers

| Metric | Epicycles | 100 Things You Should Know |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/epicycles/id6450433959/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 days | — |
| Monetization | Free | — |
| Size | 4 MB | 1 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Limit Point Software](https://appshunter.io/developer/377981570) | [Thomas Richardson](https://appshunter.io/developer/1887851473) |

## What reviewers say

### Epicycles

[App page](https://appshunter.io/ios/app/epicycles/id6450433959)

Explore the visualization of complex Fourier series through interactive epicycles. Create and analyze approximations of parametric curves and complex functions. Save animations and export custom terms for later use.

**Highlights:** Visualize Fourier series of 2D functions, Create epicycles from drawn curves, Save custom terms to documents, Export animations as GIFs, Adjust time and number of terms, Interactive graphic elements

**Features:** macOS Compatibility

**In-app purchases:** none


### 100 Things You Should Know

[App page](https://appshunter.io/ios/app/100-things-you-should-know/id6803039123)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Science Pack | $1.99 | one-time |
| History Pack | $1.99 | one-time |
| Money Pack | $1.99 | one-time |
| Language Pack | $1.99 | one-time |
| Technology Pack | $1.99 | one-time |
| Music Pack | $1.99 | one-time |


## Frequently asked questions

### Is Epicycles free?

Epicycles is free to download, with no in-app purchases.

### Is 100 Things You Should Know free?

100 Things You Should Know is free to download, with in-app purchases available.

### Do Epicycles or 100 Things You Should Know have ads?

Neither Epicycles nor 100 Things You Should Know shows ads.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*